Note 4 - Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
	2014		2013
Numerator:
Net income	$	9,018	$	2,499
Denominator:
Weighted average outstanding shares used to compute basic net income per share		38,470		36,259
Effect of dilutive securities		1,047		1,449
Weighted average outstanding shares used to compute diluted net income per share		39,517		37,708
Net income per share - basic	$	0.23	$	0.07
Net income per share - diluted	$	0.23	$	0.07